A nobleman announced for show (6)

I believe the answer is:

appear

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'for show' is the definition.
(I know that show up is a type of appear)

I don't understand how the rest of the clue works.

Can you help me to learn more?

(Other definitions for appear that I've seen before include "Look - materialise" , "Come into sight, materialise" , "become available" , "Seem, look" , "Show up like ghost" .)

I've seen this clue in The Sun.

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